Problems building on RHEL 7.7

[bitmagewb]

When I try to build the 2.4.10 release of mod_auth_openidc on RHEL7.7, it initially fails in autogen.sh with:

automake: warnings are treated as errors
Makefile.am:88: warning: compiling 'test/test.c' in subdir requires 'AM_PROG_CC_C_O' in 'configure.ac'
Makefile.am: installing './depcomp'
parallel-tests: installing './test-driver'
autoreconf: automake failed with exit status: 1

and does not generate a Makefile.

I tried getting around that by adding AM_PROG_CC_C_O to configure.ac, that got autoconf and configure to run through successfully, but the make process fails during linking with:

libtool: link: gcc -DNAMEVER=mod_auth_openidc-2.4.11rc1 -I./src -DLINUX -D_REENTRANT -D_GNU_SOURCE -g -O2 -pthread -I/data/httpd-2.4.52/include -I/data/httpd-2.4.52/include -I/data/cjose/include -DUSE_LIBHIREDIS -D_FILE_OFFSET_BITS=64 -I/usr/include/hiredis -DUSE_MEMCACHE -g -O2 -o test/test-cmd test/test-cmd.o test/stub.o  ./.libs/libauth_openidc.a -L/data/httpd-2.4.52/lib /data/httpd-2.4.52/lib/libaprutil-1.so -lldap -llber -lexpat /data/httpd-2.4.52/lib/libapr-1.so -lrt -lcrypt -lpthread -ldl -lssl -lcurl -L/data/cjose/lib /data/cjose/lib/libcjose.so -L/usr/include/openssl/lib -L/usr/include/lib -lm -ljansson -lcrypto -lhiredis -lpcre -pthread -Wl,-rpath -Wl,/data/httpd-2.4.52/lib -Wl,-rpath -Wl,/data/cjose/lib -Wl,-rpath -Wl,/data/httpd-2.4.52/lib -Wl,-rpath -Wl,/data/cjose/lib
./.libs/libauth_openidc.a(jose.o): In function `oidc_jwk_rsa_bio_to_jwk':
/data/build/mod_auth_openidc-master/src/jose.c:1269: undefined reference to `BN_num_bytes'
/data/build/mod_auth_openidc-master/src/jose.c:1274: undefined reference to `BN_num_bytes'
/data/build/mod_auth_openidc-master/src/jose.c:1280: undefined reference to `BN_num_bytes'
collect2: error: ld returned 1 exit status
make: *** [test/test-cmd] Error 1

which appears to be OpenSSL related (openssl-libs-1.0.2k-20 on this system). I've built older versions on mod_auth_oidc on RHEL7 in the past without issues, does 2.4.10 have new requirements?

[zandbelt]

I think I've seen this issue on another distribution that has openssl 1.0.2, it requires #include <openssl/bn.h> at the top of jose.c if I remember correctly; if you can confirm this, I can include this in master

[bitmagewb]

With #include <openssl/bn.h> added to the top of ./src/jose.c, the build now completes without errors. Thank you.